William ferrell



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W..FERRELL.

* MANDRRL PoR BARREL SHAPED SPRINGS. No. 477,525. Patented June 21, 1892.

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UNITED STATES PATENT OFFICE.

WILLIAM FERRELL, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE CHARLES SCOTT SPRING COMPANY, OF SAME PLACE.

VIANDREL FOR BARREL-SHAPED SPRINGS.

SPECIFICATION fermng peut ef Lettere Patent No. 477,525, dated June 21, 1892.

Appiieaien nei Mera 2i, 1892.

To all whom it may concern,.-

Bc it known that I, WILLIAM FERRELL, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Mandrels for Bowed or Barrel-Shaped Springs, of which the following is a specification.

My invention consists of a mandrel upon which to coil bowed or barrel-shaped springs,

Io the object being to so construct such a mandrel that it can be removed from the spring after the latter is coiled and can thus be used indefinitely. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure l represents a sectional view of my improved mandrel, showing a spring coiled thereon. Fig. 2 is a sectional view, partly in elevation, illustrating the manner of remouing the mandrel from the spring, and Figs. 3 and 4 are sectional Views illustrating modifications of the invention.

True bowed or barrel-shaped springs--that is to say, springs bowed both interiorly and exteriorly-are nowformed by coilingthe strip of metal upon a wooden mandrel of the proper shape, which is afterward burned out, so that a special mandrel is required for each spring.

In order to provide a mandrel which can be used rcpeatedly,l make the mandrel by preference as shown in Figs. 1 and 2, in which c a represent a number of rings or washers largest in diameter at the center of the mandrel and gradually decreasing in diameter toward the ends of the same, so as to impart to said mandrel the desired barrel shape, these rings or Washers being strung upon a central stem b and each of said rings or Washers being of a thickness less than the space between the coils or convolutions of the spring to be wound upon the mandrel. `Vhen the spring is being wound the washers are held closely together by any suitable means-for instance, by being confined between a collar d on the central stem and a sleeve or collarf, interposed between the end ot the mandrel and part of the fixed frame of the coiling-machine, such as the part represented by dotted lines atf in Fig. l; but when the ceiling of the spring has been completed the central stem l) is withdrawn from the washers, and such of serai No. 425,755. (No model.)

the latter as are contained within the spring are discharged with the latter from the niachine. The spring does not press so closely upon the peripheries of the washers as to pre- 5 5 vent the latter` from being readily separated one from another. Hence the washers canbe readily removed from the interior of the spring by slipping them through the spaces between the coils or convolutions of the spring, as 6o shown in Fig. 2, the washers being then reapplied to the central stem or core b, so as to re-form the mandrel preparatory to the coiling of another spring.

While I prefer to form the mandrel of a series of rings or washers strung upon a central stem in the manner set forth, the mandrel can be otherwise formed without departing from the essential feature of my invention. For instance, said mandrel may consist of disks 7o of varying diameter and may be secured by longitudinal bolts i to opposite heads m, constructed for application to the appropriate parts of the ceiling-machine, an instance of such modified form of mandrel being shown in Fig. 3. The disks or Washers need not in every case, moreover, be so thin as to be removed through the spaces between the coils of the sp ring. For instance, said disks or washers may be made in halves, as shown in 8o Fig. fl, so that each half can be removed from the end of the spring. In this case one or more of the larger washers may be so thin as to be removed through the spaces between the coils of the spring, and thereby loosen the 8 5 thicker washers and permit ofthe ready sepan ration of the halves of the same.

Having thus described my invention, I claim and desire to secure by Letters Patent- 9o l. The within-described mandrel for bowed or barreleshaped springs, said mandrel consisting of a series of washers or disks decreas ing in diameter from the center toward each end of the mandrel and removable from the spring after the latter is coiled, and means for retaining said washers or disks in position for use, substantially as specified.

2. The Withirrdescribed mandrel for bowed or barrel-shaped springs, said mandrel conloo sisting of a removable central stem or core, and a series of washers mounted thereon, said washers decreasing in diameter from the een- :o which will permit of its withdrawal between the coils or oonvolutions of the spring, substantially as specified.

4. The within-described mandrel for bowed or barrel-shaped springs, said mandrel consisting of a series of Washers decreasing in di- I5 ameterfrom the centerv toward each end of the mandrel and strung upon a removable stem or Core, each washer being of a thickness which will permit of its withdrawal between the Coils or eonvolutions of the spring, sulo- 2c stantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM FERRELL.

Witnesses:

WILLIAM D. CONNER, HARRY SMITH. 

